Clip-on calculator



FIG. 1 is a front elevational view of a clip-on calculator, showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a front elevational view of the clip-on calculator of FIG. 1 , illistrating a sheet of paper shown in broken lines clipped therein.

The broken lines showing of a sheet of paper is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a clip-on calculator, as shown and described. 